One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10,13,12)(11,15,16,14)(18,22)(19,23)(25,26,29,27)(28,31,32,30)(2,5)(3,8)(10,12)(14,15)(17,18)(19,20)(21,22)(23,24) involution — undirected(2,5)(6,7)(11,16)(14,15)(18,22)(19,23)(25,27,29,26)(28,31,32,30)(1,2)(3,6)(4,5)(7,8)(9,11,13,16)(10,14,12,15)(17,19,21,23)(18,20,22,24)(25,28)(26,30)(27,31)(29,32)(1,3,4,8)(2,6,5,7)(9,12,13,10)(11,15,16,14)(17,20)(18,23)(19,22)(21,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.